Set up the framework to choose the default LWS

Resolve COMPMID-4486

Signed-off-by: Giorgio Arena <giorgio.arena@arm.com>
Change-Id: Ib38b7943bd776a6d75d1da163908724c49eae73d
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/5864
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Georgios Pinitas <georgios.pinitas@arm.com>
Reviewed-by: Gian Marco Iodice <gianmarco.iodice@arm.com>
Tested-by: Arm Jenkins <bsgcomp@arm.com>
diff --git a/src/core/gpu/cl/kernels/ClHeightConcatenateKernel.cpp b/src/core/gpu/cl/kernels/ClHeightConcatenateKernel.cpp
index 4436e98..9ff30ee 100644
--- a/src/core/gpu/cl/kernels/ClHeightConcatenateKernel.cpp
+++ b/src/core/gpu/cl/kernels/ClHeightConcatenateKernel.cpp
@@ -64,6 +64,7 @@
 ClHeightConcatenateKernel::ClHeightConcatenateKernel()
     : _height_offset(0)
 {
+    _type = CLKernelType::ELEMENTWISE;
 }
 
 Status ClHeightConcatenateKernel::validate(const ITensorInfo *src, unsigned int height_offset, const ITensorInfo *dst)